Date: Tue, 19 Nov 1996 16:11:02 -0700 From: Steve Passe <smp@csn.net> To: Tor Egge <Tor.Egge@idt.ntnu.no> Cc: smp@freebsd.org Subject: Re: Can test again... Message-ID: <199611192311.QAA20593@clem.systemsix.com> In-Reply-To: Your message of "Tue, 19 Nov 1996 23:53:58 %2B0100." <199611192253.XAA24080@pat.idt.unit.no>
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Hi, >As expected, not having APIC_LAZY defined immediately caused lost interrupts >when a new interrupt arrives before the interrupt is reenabled. for those new to this problem, the cause is "brain damage" in the design of the IO APIC. The 8259 remembers INTs that occur while masked, but the IO APIC looses them. APIC_LAZY avoids masking INTs when possible, limiting (but NOT eliminating) the problem. Scanning the mail archive will pull up past discussion of this issue. -- Steve Passe | powered by smp@csn.net | FreeBSD -----BEGIN PGP PUBLIC KEY BLOCK----- Version: 2.6.2 mQCNAzHe7tEAAAEEAM274wAEEdP+grIrV6UtBt54FB5ufifFRA5ujzflrvlF8aoE 04it5BsUPFi3jJLfvOQeydbegexspPXL6kUejYt2OeptHuroIVW5+y2M2naTwqtX WVGeBP6s2q/fPPAS+g+sNZCpVBTbuinKa/C4Q6HJ++M9AyzIq5EuvO0a8Rr9AAUR tBlTdGV2ZSBQYXNzZSA8c21wQGNzbi5uZXQ+ =ds99 -----END PGP PUBLIC KEY BLOCK-----
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